Gallons Per Minute to PSI Calculator Online

The GPM to PSI calculator is a tool designed to convert the flow rate of water, measured in gallons per minute, to the pressure in pounds per square inch. This is vital for designing and analyzing fluid systems to ensure they meet safety and functionality standards.

Formula of Gallons Per Minute to PSI Calculator

The formula used in this calculator is straightforward:

Where:

• GPM represents the flow rate in gallons per minute.
• A is the cross-sectional area of the pipe in square inches.

To find the cross-sectional area (A), use the formula:

A = (π * d^2) / 4

Here:

• π (Pi) is approximately 3.14159.
• d is the internal diameter of the pipe in inches.

Table of Common Conversions

Below is a table featuring common pipe diameters and the corresponding PSI for various GPM values, allowing for quick reference:

Pipe Diameter (inches)	GPM	Cross-sectional Area (sq inches)	PSI
0.5	5	0.1963	212.12
0.5	10	0.1963	424.24
0.5	15	0.1963	636.37
0.5	20	0.1963	848.49
0.5	25	0.1963	1060.61
1	5	0.7854	53.03
1	10	0.7854	106.06
1	15	0.7854	159.09
1	20	0.7854	212.12
1	25	0.7854	265.15
1.5	5	1.7671	23.57
1.5	10	1.7671	47.14
1.5	15	1.7671	70.71
1.5	20	1.7671	94.28
1.5	25	1.7671	117.85
2	5	3.1416	13.26
2	10	3.1416	26.52
2	15	3.1416	39.77
2	20	3.1416	53.03
2	25	3.1416	66.29

Example of Gallons Per Minute to PSI Calculator

To illustrate, let’s calculate the PSI for a flow of 10 gallons per minute through a 1-inch diameter pipe:

1. Calculate the area: A = (3.14159 * 1^2) / 4 = 0.785 sq. inches.
2. Then calculate PSI: PSI = (10 * 8.33) / 0.785 = approximately 106 PSI.

Most Common FAQs